Measuring material wastage on construction sites: a case study of local authority highway projects

The construction industry in the UK is vast. It is one of the largest sectors of the economy with an output of over £100 billion, representing approximately 8% of the country’s GDP. The enormous amount of resources the industry consumes and produces coupled with the large number of construction companies in the market place has resulted in a growing awareness of the environmental impact of the construction industry. Construction produces more than 100 million tonnes of waste a year, representing more than 50% of the total waste production of the country. Of this waste, more than 60 million tonnes goes straight to landfill, three times more than all the domestic waste produced by the UK’s twenty one million homes. Increasing pressure on landfill sites coupled with the growing awareness of the environmental impact of the industry has made the minimisation of construction waste absolutely essential. The research project outlined in this paper attempts to measure material wastage occurring on selected Local Authority highway construction sites. To achieve this, a review will be undertaken to determine the main areas of interest in sustainable construction, construction waste production, and waste minimisation. Primary data will be collected in the form of measurements taken of theoretical and actual quantities of construction materials used during the course of selected highway projects. The results will be used to compare actual on-site material quantities against theoretical material quantities. The difference in these quantities will then be calculated, giving the amount of wastage occurring on site. The findings from this paper are drawn from both the secondary and the primary data analysis and statistical testing. The research concludes by suggesting a waste minimisation strategy for use on highway construction sites to try and reduce, re-use, and recycle the amount of construction waste local authority highway projects generate

Perception enhancement system for automotive steering

Laboratory-based experiments were conducted to evaluate the effect of the frequency and scale of transient vibration events on the human detection of road surface type by means of steering wheel vibration. The study used steering wheel tangential direction acceleration time histories which had been measured in a mid-sized European automobile that was driven over three different types of road surface. The steering acceleration stimuli were manipulated by means of the mildly non-stationary mission synthesis (MNMS) algorithm in order to produce test stimuli which were selectively modified in terms of the number, and size, of transient vibration events they contained. Fifteen test participants were exposed to both unmanipulated and manipulated steering wheel rotational vibration stimuli, and were asked to indicate, by either “yes or no”, whether the test stimuli was from a target road surface which was displayed on a board. The findings suggested that transient vibration events play a key role in the human detection of road surface type in driving situations. Improvements of up to 20 percentage points in the rate of correct detection were achieved by means of selective manipulation of the steering vibration stimuli. The results also suggested, however, that no single setting of the MNMS algorithm proved optimal for all three road surface types that were investigated

Determination of Priorities for Footway Reconstruction

This report describes a study conducted for Sheffield City Council to obtain pedestriansr reactions to the quality and acceptability of footways of different construction in different conditions, and to assess pedestriansr preferences for different types of footway construction. The results are intended to aid the Council in identifying priorities for the maintenance of existing footways, and preferred surfaces for new or reconstructed footways. The study involved four stages; a new survey to identify footway characteristics of concern to pedestrians; interviews and objective measurements at a total of 13 sites; interviews at a set of eight purpose built trial sites; and analysis and interpretation of the results

Perception enhancement for steer-by-wire systems

Modern automobiles are safer and more comfortable than ever before. If there is one criticism that can be made, however, it is that the achievement of higher levels of comfort has sometimes come at the expense of a lack of driver involvement. The issue of driver involvement can become critical in the case of by-wire systems since these systems do not necessarily have a predetermined path or transfer mechanism for carrying stimuli to the driver. This article discusses the technical requirements of perception enhancing systems for the vehicle steering

Effect of transient event frequency content and scale on the human detection of road surface type

This paper describes two laboratory-based experiments which evaluate the effect of transient event frequency content and scale on the human detection of road surface type by means of steering wheel vibration. This study used steering wheel tangential direction acceleration time histories which had been measured in a mid-sized European automobile that was driven over two different types of road surface. The steering acceleration stimuli were manipulated by means of the mildly non-stationary mission synthesis (MNMS) algorithm in order to produce test stimuli which were selectively modified in terms of the number, and size, of transient vibration events they contained. Fifteen test participants were exposed to both unmanipulated and manipulated steering wheel rotational stimuli by means of a steering wheel vibration simulator. For each road surface type a total of 45 vibration test stimuli were presented to each participant. Each participant was asked to state, by means of a simple "yes" or "no" answer, whether each individual stimuli was from a road surface which was being presented in front of the simulator as a picture on a large board. Using Signal Detection Theory as the analytical framework the results were summarized by means of the detectability index d' and by means of receiver operating curve (ROC) points. Improvements of up to 20 percentage points in the rate of correct detection were achieved by means of selective manipulation of the steering vibration stimuli. The results suggested that no single setting of the MNMS algorithm proved optimal for both two road surface types that were investigated

Initial Conditions and Changes in Commercial Fertilizers under the Farm Input Subsidy Programme in Malawi: Implications for Graduation

The government of Malawi has been implementing agricultural input subsidies since 2005/06 as an intervention aimed at improving food security among resource poor smallholder farmers. Although the issue of graduation is not articulated in the design of the programme, this study investigates the determinants of changes in the demand for commercial fertilizers in the presence of the subsidy programme. The increase in purchase of commercial fertilizers by subsidized households may indicate prospects of graduation from the subsidy programme in future. Using panel data between the 2004/05 and 2008/09 seasons, we find that 6 percent of households that did not purchase ommercial fertilizer in 2004/05 could afford to purchase fertilizers commercially in subsidy years. Relative to those that never purchase fertilizers, these households tend to have higher per capita expenditure and higher values of durable assets. The econometric results show that initial conditions matter, with initial household size, per capita expenditure, agricultural output, and existence of business enterprise all playing a positive role in the changes in demand for commercial fertilizer. We also find that commercial fertilizers decreases with initial commercial fertilizers, land holdings and existence of ADMARC. The results suggest that the poor may have low prospects of graduation and less involvement of ADMARC and greater participation of the private sector can help in improving the ‘potential graduation conditions’

Human emotional response to steering wheel vibration in automobiles

This is the post-print (final draft post-refereeing) version of the final published paper that is available from the link below. Copyright @ 2013 Inderscience Enterprises Ltd.This study investigates what form of correlation may exist between measures of the valence and the arousal dimensions of the human emotional response to steering wheel vibration and the vibration intensity metrics obtained by means of the unweighted and the frequency weighted root mean square (rms). A laboratory experiment was performed with 30 participants who were presented 17 acceleration time histories in random order and asked to rate their emotional feelings of valence and arousal using a self-assessment manikin (SAM) scale. The results suggest a highly linear correlation between the unweighted, Wh weighted and Ws weighted vibration intensity metrics and the arousal measures of the human emotional response. The results also suggest that while vibration intensity plays a significant role in eliciting emotional feelings, there are other factors which influence the human emotional response to steering wheel vibration such as the presence of high peaks or high frequency band amplitudes